Commit 4549cadf authored by Committed by Marge Bot
Make sure mkSplitUniqSupply stores the precomputed mask only.
mkSplitUniqSupply was lazy on the boxed char. This caused a bunch of issues: * The closure captured the boxed Char * The mask was recomputed on every split of the supply. * It also caused the allocation of MkSplitSupply to happen in it's own (allocated) closure. The reason of which I did not further investigate. We know force the computation of the mask inside mkSplitUniqSupply. * This way the mask is computed at most once per UniqSupply creation. * It allows ww to kick in, causing the closure to retain the unboxed value. Requesting Uniques in a loop is now faster by about 20%. I did not check the impact on the overall compiler, but I added a test to avoid regressions.
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